[Mristudio-users] gradient table normalization? b0 image b-value?

[susumu]

Hi Yi,

I think you don't have to. The only number you have to be careful is [100,
100, 100]. You can't use this combination because this is set aside to
instruct DtiStudio to "Ignore the image".

-----Original Message-----
From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Yi Jiang
Sent: Thursday, March 05, 2009 10:29 AM
To: DTI Studio, ROI Editor, Landmarker Questions/Support
Subject: [Mristudio-users] gradient table normalization? b0 image b-value?

Hello, when I use a .dpf file to calculate diffusion tensor, should I 
normalize the gradient table? For example, can I use the following lines in 
the .dpf file or do I have to normalize the gradient table? Will the 
normalization or non-normalization affect the calculated diffusivity values?

---------------------------

        B-Value: 1000

        Begin_Of_Gradient_Table
  0: 0,0,0
  1: 45.3060,   15.6000,   36.1080
  2: 1.4340,  -20.4720,   56.3820
  3: 12.6960,   50.9160,   29.0880
  4: -28.7580,   42.6360,   30.9000
  5: -23.6280,  -37.8120,   40.1460
  6: -36.9540,   15.6900,   44.5860
  7: 33.4800,  -44.4300,   22.4760
  8: -57.2400,   -4.0020,   17.5440
  9: 51.7140,  -24.1140,   18.5400
  10: 13.7760,   12.4080,   57.0660
  11: -47.2500,  -36.9180,    2.0940
  12: -2.0760,  -59.3820,    8.3520
        End_Of_Gradient_Table

---------------------------

Moreover, if my b0 file has some small value (not exactly 0), such as b0 has

b-value of 10 and other DWIs has b-value of 1000, how can I indicate that in

the .dpf file?

Thank you very much!

Best,
Yi


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